Calculateur de One Rep Max
Estimate one-rep max from weight and repetitions using the Epley formula.
Formula and method
This calculator computes Estimated one-rep max directly in your browser without sending data to an external server.
Mathematical formula
- Estimated one-rep max:
weight × (1+reps ÷ 30)
Variables and parameters
- Weight lifted (weight): default value 185 lb.
- Repetitions (reps): default value 5.
Some formulas are undefined for certain input combinations (such as division by zero or logarithms of non-positive numbers). In those cases the live tool displays an alert instead of NaN.
Embed this tool
Paste this snippet into your own site or blog post to embed a live, working copy of this tool. It links back to the full page on SpecWhale.
Frequently asked questions
What equation and variables does One Rep Max Calculator use?
One Rep Max Calculator evaluates outputs such as <strong>Estimated one-rep max</strong> based on inputs including Weight lifted, Repetitions. Check the Mathematical Method section for the explicit formula.
What should I keep in mind when interpreting One Rep Max Calculator metrics?
Health and body calculators provide general estimates derived from standard population equations. Individual physiological differences (such as muscle mass or hydration) can alter personal results.
What happens if I enter invalid or zero values into One Rep Max Calculator?
If an input combination is mathematically undefined (such as division by zero or negative square roots), SpecWhale alerts you gracefully rather than returning invalid NaN outputs.
Are my calculations in One Rep Max Calculator saved or private?
All calculations are 100% private and run locally in your Web browser. Your numbers are never uploaded to any server, but can be saved locally to your device or exported as CSV/JSON.
Is One Rep Max Calculator free to use?
Yes. One Rep Max Calculator is completely free, has no usage limit, and does not require an account, email, or API key.
Does One Rep Max Calculator store or upload my data?
No. One Rep Max Calculator calculates everything locally in your browser. Nothing you type is sent to a server or stored by SpecWhale.
How accurate is One Rep Max Calculator?
One Rep Max Calculator uses a standard formula (see the Method section above for the exact expression). For high-stakes financial, medical, or legal decisions, confirm the result with a professional or an authoritative source before relying on it.
Can I embed One Rep Max Calculator on my own website?
Yes. Use the "Embed this tool" snippet on this page to add a free, working copy of One Rep Max Calculator to your own blog post or page.